At a high fixed temperature, the first-order decomposition of N 2 O 5 (g) produc

Question

At a high fixed temperature, the first-order decomposition of N2O5(g) produces NO2(g) and O2(g). If the initial concentration of 0.400 M for N2O5(g) is reduced to 0.169 M after 118 seconds, What is the rate constant, k, for the reaction?

Select one:

A. 1.96 x 10?3 s-1

B. 1.37 x 102 s-1

C. 7.30 x 10?3 s-1

D. 4.37 x 10?3 s-1

At a high fixed temperature, the first-order decomposition of N2O5(g) produces NO2(g) and O2(g). If the initial concentration of 0.400 M for N2O5(g) is reduced to 0.169 M after 118 seconds, What is the rate constant, k, for the reaction? Select one: A. 1.96 x 10?3 s-1 B. 1.37 x 102 s-1 C. 7.30 x 10?3 s-1 D. 4.37 x 10?3 s-1

Explanation / Answer

ln[A]=?kt+ln[A]o

k=ln[A]o-ln[A]/t

=ln(0.400)-ln(0.169)/118

=7.30 x 10-3 s-1

answer is c

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